The A80 SoC has configuration registers for I/O bias voltage. Incorrect
settings would make the affected peripherals inoperable in some cases,
such as Ethernet RGMII signals biased at 2.5V with the settings still
at 3.3V. However low speed signals such as MDIO on the same group of
pins seem to be unaffected.
Previously there was no way to know what the actual voltage used was,
short of hard-coding a value in the device tree. With the new pin bank
regulator supply support in place, the driver can now query the
regulator for its voltage, and if it's valid (as opposed to being the
dummy regulator), set the bias voltage setting accordingly.
Add a quirk to denote the presence of the configuration registers, and
a function to set the correct setting based on the voltage read back
from the regulator.
This is only done when the regulator is first acquired and enabled.
While it would be nice to have a notifier on the regulator so that when
the voltage changes, the driver can update the setting, in practice no
board currently supports dynamic changing of the I/O voltages.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Old pinctrl drivers will need to disable strict mode for various reasons,
among which:
- Some DT will still have a pinctrl group for each GPIO used, which will
be rejected by pin_request. While we could remove those nodes, we still
have to deal with old DTs.
- Some GPIOs on these boards need to have their pin configuration changed
(for bias or current), and there's no clear migration path
Let's disable the strict mode on those SoCs so that there's no breakage.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
The Kconfig currently controlling compilation of this code is:
drivers/pinctrl/sunxi/Kconfig:config PINCTRL_SUN9I_A80_R
drivers/pinctrl/sunxi/Kconfig: def_bool MACH_SUN9I
...meaning that it currently is not being built as a module by anyone.
Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.
Since module_platform_driver() uses the same init level priority as
builtin_platform_driver() the init ordering remains unchanged with
this commit.
Also note that MODULE_DEVICE_TABLE is a no-op for non-modular code.
We also delete the MODULE_LICENSE tag etc. since all that information
is already contained at the top of the file in the comments.
Cc: Chen-Yu Tsai <wens@csie.org>
Cc: linux-gpio@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Like the previous designs, the A80 has a special pin controller for the
critical pins, like the PMIC bus.
Add a driver for this controller.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
[wens: Add A80 compatible strings to bindings doc; fix pin function
names based on v1.3 datasheet; constify of_device_id table]
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
